Electron energy transport in the presence of rational surfaces in the Wendelstein 7-AS stellarator

Electron energy transport in the presence of rational surfaces in the Wendelstein 7-AS stellarator
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Wendelstein 7-AS 仿星器中存在有理表面时的电子能量传输

DOI:
10.1088/0029-5515/42/7/313
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发表时间:
2002
期刊:
影响因子:
3.3
通讯作者:
W. Team
W. Team
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
R. Brakel;W. Team

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当磁剪切较低时,Wendelstein 7-AS 仿星器中的电子能量传输对旋转变换的边界值表现出很强的敏感性。接近低阶有理值的明显限制最大值与这些有利范围内其他有理数的低密度相关。如果大等离子体电流增加了磁剪切力,则这种依赖性就会消失。提出的假设是,在合理的通量表面上,电子能量传输增加到已经异常的水平之上,并且磁剪切减少了额外的增强。将这些特征合并到电子热导率的简单表达式中的经验模型可以重现各种外部控制参数的实验依赖性,例如旋转变换和净等离子体电流。除了明确的剪切依赖性外,该模型与 RTP 模型具有显着的相似性,RTP 模型成功地描述了 RTP 和其他托卡马克中低阶有理 q? 表面附近的电子传输势垒。
Electron energy transport in the Wendelstein 7-AS stellarator exhibits a strong sensitivity to the boundary value of the rotational transform when the magnetic shear is low. Pronounced confinement maxima close to the low order rational values correlate with a low density of other rational numbers in these favourable ranges. The dependence is lost if magnetic shear is increased by large plasma currents. The hypothesis is proposed that, at rational flux surfaces, electron energy transport is increased above the already anomalous level and that magnetic shear reduces the additional enhancement. An empirical model that incorporates these features into a simple expression for the electron heat conductivity can reproduce the experimental dependences over a wide range of external control parameters, e.g. the rotational transform and the net plasma current. Except for the explicit shear dependence, this model bears a remarkable similarity to the RTP model, which successfully describes the electron transport barriers near low order rational q?surfaces in RTP and other tokamaks.
伊藤公隆:等离子体物理学和受控聚变。31。(1989)
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材料百科全书:科学技术更新
DOI: --
发表时间: 2005
期刊:
影响因子: --
作者:
T.Nakano;Y.Tabata;Y.Umakoshi
通讯作者: Y.Umakoshi